Journal of Korean Society for Quality Management (품질경영학회지)

Korean Society for Quality Management (한국품질경영학회)
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The Relation between the Process Capability Index and the Quality Assurance Level Considering Various Conditions

다양한 상황을 고려한 공정능력지수와 품질보증수준의 관계

  • 조문수 (숭실대학교 산업·정보시스템공학과) ;
  • 임태진 (숭실대학교 산업·정보시스템공학과)
  • Published : 2002.06.01
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Abstract

This paper investigates the relation between the Process capability index(PCI) and the quality assurance level under various conditions. The effect of the off-targetness of the process mean, deviation from the nomality, the estimation error, and tile measurement error on the quality assurance level is evaluated. Various distributions such as the Student-t, the chi-square, the gamma, the Weibull, and the log-normal distributions are considered to evaluate the deviation from the nomality. The quality levels under abnormal conditions turn out to be severely different from that under the standard condition. We provide tables and graphs of the quality assurance level on various abnormal conditions. In order for the industry users to use the PCI properly, they should refer to the tables and graphs, especially when they are not certain about the standard assumptions on which the PCI depends.

Keywords

References

  1. 김홍준, 김진수, 송서일 (1999), '불량률의 측도로 비정규 공정능력의 평가: Gamma 분포,' '품질경영학회지' 27권, 1호, pp. 18-34
  2. 백재욱, 조진남 (1999), '공정능력지수에 대한 비평과 올바른 공정능력분석절차,' '품질경영학회지' 27권, 2호, pp.81-100
  3. 송서일, 조영찬 (1999), '검사정밀도를 고려한 공정능력지수의 결정,' '품질경영학회지' 27권, 4호, pp.114-122
  4. 임태진, 변시섭 (2000), '불량률과 일치하는 공정능력지수,' '품질경영학회지' 28권, 2호, pp.103-122
  5. Chan, L. K.; Cheng, S. W.; and Spiring, F. A. (1988) 'A New Measure of Process Capability,' Journal of Quality Technology, 20, pp.162-175
  6. Hsiang, T. C. And Taguchi, G. (1985) 'A Tutorial on Quality Control and Assurance - The Taguchi Methods,' ASA Annual Meeting, Las Vegas, NV
  7. Juran, J. M., Ed. (1974) Quality Control Handbook, 3rd ed.McGraw-Hill, New York, NY
  8. Kane, V. E. (1986) 'Process Capability Indices,' Journal of Quality Tecbnology, 18, pp.41-52
  9. Kotz S. and Johnson, N.L.(1993), Process Capability Indices, Chapman and Hall
  10. Peam, W. L.; Kotz, S.; and Johnson, N. L. (1992) 'Disthbutional and Inferential Properties of Process Capabilities,' Journal of QuaIityTechnotogy, 24, pp.216-231
  11. Rodhguez, R. N.(1992), 'Recent Development in Process Capability Analysis' Journal of Quality Technology, 24(4). pp. 176-187
  12. Spiring, F. A.(1997). 'A Unifying Approach to Process Capability Indices,' Journal of Quality Technology, 29, pp.49-58